@Axle, you may want to check these links out: Rules | How to use images | Search
@Cazaron, your sig looks very good. I don't agree with Boude, you can clearly see the DNA thing. At least I can.
I like the position of the text but it looks like it's tilted slightly to the left. You can hardly see it though.
The edges of the laptopsĀ“s screen look a tiny bit aliased.
I'm not sure where the focal is but on the other hand I don't think it needs a focal.
Over all it looks very good. I don't know how you could improve it.
I hope this helps